Looks like you are looking for PC2100 PC2700 or PC3200 DDR Ram, Best Buy or Circuit City may even have what you are looking for. CompUsa may also be a good choice, as well as www.newegg.com which has very good deals on alot of computer hardware.

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Yes, with this model, Mix and match is ok. Different sizes/speeds
of memory can be used together as long as their specification are qualified by
the systems. For instance, a laptop can use one 512MB and one 2GB of memory for
the total of 2.5GB system memory. Mixing two different speeds of memory modules
would result the system to run at the speed of the slower memory between the two
modules.

You need a 512MB
PC2700 DDR 333MHz SO-DIMM for a laptop (200-pin). The
manufacturer I think doesn't specifically support anything over 512MB. But the RAM is standard and I doubt there is any need to buy it directly from Sharp. The laptop only has one upgradable bay so you may not be able to upgrade past 1.25 GB.

One of the memory covers is not removable, if I remember correctly, that is the one under the keyboard. So the one you update is a panel on the bottom.

if your pc is old, it may not be compatible with that amount of memory.. check to see your are buying the correct type of memory, a lot of pc's vary depending on model.. be sure to push down firmly when installing the memory stick.. hope this helps

Never, NEVER buy a computer that is going to run Vista with less than 1Gig minimum!
2 Gigs of RAM is recommended for Vista.
To check on prices and the type check some online sites that sell memory

Most laptops have a removable door or hatch on the bottom where you can
access the memory very easily. The modules easily clip in or out but
never use force! (RTFM)
If you take it to someone, they'd probably charge $50 for labour, plus parts and the job takes 5 minutes.

Easily do it yourself, or find a teenager who's good with computers. Son, nephew, neighbour perhaps?

Before buying any new modules, check your laptop to see how many slots you have and what type of modules are in there now.
To upgrade to 2 Gig, you will have to buy 2 new 1Gig modules, There's a 2Gig kit (1Gigx2) listed at one site for $80.

You would remove you current memory and install the 2 new 1Gig modules. Sell your 512 or make a keychain from it.